I used an Attwood Fuel Line Vent Surge Protector along with plenty of hose coiled and creatively routed. I have had no issues since I did this. I top the tank off and tow down a very hilly and curvy road with no fuel coming out of the vent. I have to fill slowly at the pump, but I always had to.

I used an Attwood Fuel Line Vent Surge Protector along with plenty of hose coiled and creatively routed. I have had no issues since I did this. I top the tank off and tow down a very hilly and curvy road with no fuel coming out of the vent. I have to fill slowly at the pump, but I always had to.

I'm not really sure, but I thought the vent was supposed to vent both ways as described on my previous post. If fuel leaking is your only concern, I would start with just the extra fuel line tied up as high as you can and only install the check valve if it still leaks.

That valve has worked great. It allows vapor out while I am filling (I see the fumes coming out of the vent) and air in while running. The check ball closes when pushed closed by fuel and it probably doesn't close 100% then.

I don't know if it was the valve, the hose or both, but I never have liquid gasoline coming out of the vent now and have experienced zero problems.

So I was getting fumes underway but also when the boat was backed into the garage. If I was working in the boat, and moving around, it would cause the fuel in the tank to move around and drive a lot of fumes out the vent.

So my initially I was going to make my own filter using active carbon and place it in line with the vent hose. With all the new emissions regulations placed on the marine industry, it appears Delphi has paired up with Perko to offer carbon fuel canisters technology from the auto industry to the marine industry. I had a hard time finding these but finally found them from a supplier on the west coast.

Also of note, I had to find the plastic reducer from the 3/4" vent line to the 5/8" of the new canister. I have used this for well over a year with out any issues, I just did not get any chance to post up the pictures.

The way it works is the active carbon in the filter absorbs the fuel fumes and filters them prior to the vent. Then, once under way and you burn fuel, the draw of fuel out of the tank draws in air from the vent and pulls the fuel fumes in the filter back into the tank. I had no issues filling up with fuel either on the lake or at the local gas stations on the trailer. Also, I had no issues pumping fuel to the engine underway.

The best part is that I have no unwanted fuel fumes while underway or when working on the boat when it is backed into the garage!! Success!!